Compound Interest Calculator

See how your money grows with compound interest. Enter a starting amount, monthly contribution, expected annual return, and number of years.

RESULT

$124,379.03

Future value after 20 years

$53,000.00

You put in

$71,379.03

Interest earned

Formula

FV = P(1+i)ⁿ + c·((1+i)ⁿ − 1)/i where i = rate/12, n = months

Example: $5,000 plus $200/month at 7% for 20 years grows to $124,379.03.

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Frequently asked questions

What is compound interest?

Compound interest is interest earned on both your original money and the interest it has already earned. Over long periods this snowball effect drives most investment growth.

How often does it compound here?

This calculator compounds monthly and adds your contribution each month, which is a common assumption for savings and retirement accounts.